Re: Heat Shield

I d be curious to know how Buzz put his boiler-like shroud together, and how well it holds up in service. I had something similar (minus the wood lagging) on

Message 1 of 6
, Feb 8, 2007

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I'd be curious to know how Buzz put his boiler-like
shroud together, and how well it holds up in service.
I had something similar (minus the wood lagging) on
Popflea once, briefly, but the waste heat from the
flame licking around the tube coil caused the solder
joints to melt after a few minutes, and the whole
thing collapsed and nearly set the boat on fire. With
a normal steam boiler you have the water inside to
absorb the heat away from the metal, so the solder
joints won't melt unless the boiler runs dry. A
pop-pop shroud, at least the one I had on Popflea
anyway, is like a boiler that's always dry. Not
having a good idea of how to build a shroud that would
stand up to the heat was the main reason I stopped
work on "Popfly", the pop-pop near-sister to Firefly.
She just woulnd't have looked right without something
resembling a steam launch boiler as part of her
profile.

Richard Jenkins

David Halfpenny

... From: Richard Jenkins To: ... I can t get to my Boat Box at the moment but I have three

> Not
> having a good idea of how to build a shroud that would
> stand up to the heat was the main reason I stopped
> work on "Popfly", the pop-pop near-sister to Firefly.
> She just woulnd't have looked right without something
> resembling a steam launch boiler as part of her
> profile.
>

I can't get to my Boat Box at the moment but I have three suggestions.

One is this commercial coil-type motor,http://tinyurl.com/e6s9y
whose boiler shroud, perforated for combustion and "is it still alight?"
checking, is a tight fit on flanged top and bottom plates. It comes apart
to fit a Tea-light candle. The pipe ends drop vertically through the base
and turn at 90. So the hull needs quite a big hole in it, which the motor
is sealed into with silicone etc.

The next is the top from a spun aluminium "gurly smell" aerosol. Cutting
into pressurised cans is somewhat frowned apon by Insurers etc but you can
get manual aerosols of this shape, with a nice domed top and a short
parallel upstand you can fit and Uptake to:http://tinyurl.com/yunsbb

Finally, use a rolled or roll-jointed baby-food tin, upside down. The only
joint needed is for the Uptake, and a press-fit of some kind would make
sense.http://tinyurl.com/2pwldb
You can see how small the tin is by the size of the ring-pull on it!

The last two need ventilation gaps either in the shroud itself or (easier)
in the bilges.

David 1/2d

Pete B.

Richard- I like David s recycle approach. That is definitely worth pursuing. The boat scale becomes an issue. Another option might be a higher temp solder or

Message 3 of 6
, Feb 8, 2007

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Richard-

I like David's recycle approach. That is definitely worth pursuing. The boat scale becomes an issue. Another option might be a higher temp solder or epoxy adjacent to the heat source.

I uploaded a link a little bit ago. If you look in Pop-pop Plans for BATH TUB STEAMBOAT you'll find a design for a heat shield on a wooden pop-pop. It may be something you could use in your design.

>> I'd be curious to know how Buzz put his boiler-like> shroud together, and how well it holds up in service. > I had something similar (minus the wood lagging) on> Popflea once, briefly, but the waste heat from the> flame licking around the tube coil caused the solder> joints to melt after a few minutes, and the whole> thing collapsed and nearly set the boat on fire. With> a normal steam boiler you have the water inside to> absorb the heat away from the metal, so the solder> joints won't melt unless the boiler runs dry. A> pop-pop shroud, at least the one I had on Popflea> anyway, is like a boiler that's always dry. Not> having a good idea of how to build a shroud that would> stand up to the heat was the main reason I stopped> work on "Popfly", the pop-pop near-sister to Firefly. > She just woulnd't have looked right without something> resembling a steam launch boiler as part of her> profile.> > Richard Jenkins>

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